Power electronic transformer with true bipolar DC output ability and application control

A technology of DC output and power electronics, which is applied in the direction of high-efficiency power electronics conversion, DC power input conversion to DC power output, and output power conversion devices. Ease of control, volume-reducing effect

Active Publication Date: 2019-06-07
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current bipolar output converters are often pseudo-bipolar output. Although the positive and negative DC bus voltage can be balanced under the condition of unbalanced positive and negative loads, in the case of unipolar short circuit or open circuit fault , the non-faulty pole still cannot operate

Method used

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  • Power electronic transformer with true bipolar DC output ability and application control
  • Power electronic transformer with true bipolar DC output ability and application control
  • Power electronic transformer with true bipolar DC output ability and application control

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Embodiment Construction

[0031] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0032] The present invention designs a power electronic transformer with true bipolar DC output capability. In practical applications, such as figure 1 As shown, it specifically includes an input-side filter circuit 1, a full-bridge converter 2, an isolation transformer 3, a full-bridge / three-level combined converter 4, and an output-side filter circuit 5; wherein, the input-side filter circuit 1 includes a DC capacitor C in and DC supply V in , DC capacitance C in with DC supply V in The positive and negative terminals of the input side are connected in parallel; the output terminal of the filter circuit 1 on the input side is connected with the input terminal of the full bridge converter 2 .

[0033] The isolation transformer 3 includes the transmission inductance L s and the medium and high frequency transformer T...

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Abstract

The invention relates to a power electronic transformer with true bipolar DC output ability. By controlling a switch tube of a full-bridge / three-level combined converter (4), the balance of anode andcathode DC output voltage is realized, and the normal operation of non-fault pole DC output under a single pole fault condition is realized; by controlling a full-bridge converter (2) and the full-bridge / three-level combined converter (4), the original secondary side voltage of an isolation transformer (3) is adjusted, so that bidirectional transmission adjustment of input and output side power isrealized; a soft switch of a switch device in the converter can be realized, so that the operation efficiency of the converter is enhanced; the designed converter can be combined with a cascaded H bridge converter or a modularized multi-level converter to form the power electronic transformer with medium / high-voltage AC input and true bipolar DC output; and a DC converter with true bipolar DC output ability can be formed through series-parallel connection of modules.

Description

technical field [0001] The invention relates to a power electronic transformer with true bipolar DC output capability and its application control, which belongs to the technical field of electric energy conversion devices. Background technique [0002] In the low-voltage DC power distribution system, there are mainly two system structures of pseudo-bipolar and true bipolar busbars. For the pseudo-bipolar DC power distribution system, the positive and negative bus voltages cannot be adjusted independently. When a single-pole open circuit occurs, the non-faulty pole cannot continue to operate, resulting in the paralysis of the overall DC power distribution system. For a true bipolar DC power distribution system, the positive and negative DC bus voltages can be adjusted independently. Even if a unipolar DC bus fault occurs, the non-faulty poles can still operate normally. At present, in order to form a true bipolar DC power distribution system, two sets of converter / converter ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCY02B70/10
Inventor 陈武舒良才
Owner SOUTHEAST UNIV
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